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//
// Copyright 2014 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
module axi_fifo32_to_fifo64
(input clk, input reset, input clear,
input [31:0] i_tdata, input [1:0] i_tuser, input i_tlast, input i_tvalid, output i_tready,
output [63:0] o_tdata, output [2:0] o_tuser, output o_tlast, output o_tvalid, input o_tready
);
reg [31:0] holding;
reg state;
always @(posedge clk)
if(reset | clear)
state <= 0;
else
if(i_tvalid & i_tready)
case(state)
0 : if(~i_tlast) state <= 1'b1;
1 : state <= 1'b0;
default : state <= 1'b0;
endcase // case (state)
always @(posedge clk)
if(i_tvalid & i_tready)
holding <= i_tdata;
assign i_tready = (state == 0 && !i_tlast)? 1'b1 : o_tready;
assign o_tvalid = (state == 0 && !i_tlast)? 1'b0 : i_tvalid;
assign o_tdata = (state == 0) ? {i_tdata, 32'h0} : { holding, i_tdata };
assign o_tlast = i_tlast;
wire [2:0] occ_in = (i_tuser == 0) ? 3'd4 : {1'b0, i_tuser};
wire [2:0] occ_out = (state == 0) ? occ_in : (occ_in + 3'd4);
assign o_tuser = ~o_tlast ? 3'd0 : occ_out;
endmodule // axi_fifo32_to_fifo64
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